SixLabors.ImageSharp version bump.

Otherwise, dotnet build will fail.

Author: masaru-kimura-hacarus

src/Examples.Utils/Examples.Utils.csproj

@@ -17,7 +17,7 @@
 
   <ItemGroup>
     <PackageReference Include="SharpZipLib" Version="1.4.0" />
-    <PackageReference Include="SixLabors.ImageSharp" Version="3.1.7" />
+    <PackageReference Include="SixLabors.ImageSharp" Version="3.1.11" />
   </ItemGroup>
 
   <ItemGroup>